punctual

Concise Oxford English Dictionary © 2008 Oxford University Press:
punctual /ˈpʌŋ(k)tʃʊəl, -tjʊəl/

▶adjective

• 1 happening or doing something at the appointed time.

• 2 Grammar of or denoting action that takes place at a particular point in time. Contrasted with durative.

– derivatives
punctuality noun,
punctually adverb.

– origin C17: from med. L. punctualis, from L. punctum ‘a point’.